export default {
  namespaced: true,

  state: () => ({
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  mutations: {
    addToCart(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (!findResult) {
        //购物车里面没有该商品
        state.cart.push(goods)
      } else {
        //购物车里面有该商品 使该商品的count +1
        findResult.goods_count++
      }
      //通过commit方法调用m_cart命名下的saveToStorage方法
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state) {
      uni.setStorageSync('cart', JSON.stringify(state.cart))
    },
    //更新购物车中商品的勾选状态
    updateGoodsState(state, goods) {
      const findResquest = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResquest) {
        findResquest.goods_sate = goods.goods_sate
        this.commit('m_cart/saveToStorage')
      }
    },
    //更新商品数量
    updateGoodsCount(state, goods) {
      const findResquest = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResquest) {
        findResquest.goods_count = goods.goods_count
        this.commit('m_cart/saveToStorage')
      }
    },
    removeGoodsById(state, goods) {
      state.cart = state.cart.filter(x => x.goods_id !== goods.goods_id)
      this.commit('m_cart/saveToStorage')
    },
    updateAllGoodsState(state, newState) {
      state.cart.forEach(x => x.goods_sate = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  getters: {
    //购物车商品总数量
    total(state) {
      // let c = 0
      // state.cart.forEach(x => c += x.goods_count)
      // return c
      return state.cart.reduce((total, item) => total += item.goods_count, 0)
    },
    //购物车所有已勾选的商品数量
    checkedCount(state) {
      return state.cart.filter(x => x.goods_sate).reduce((total, item) => total += item.goods_count, 0)
    },
    checkedGoodsAmount(state) {
      return state.cart.filter(x => x.goods_sate).reduce((total, item) => 
        total += item.goods_count * item.goods_price, 0).toFixed(2)
    }
  }
}
